John Legend has become world famous for his chart-topping ballad “All of Me” and role in the Oscar-nominated musical “La La Land,” but his visit to the Louisiana Capitol on Wednesday was serious business. “We can’t tolerate a system that destroys so many lives and so many communities,” Legend told the House Judiciary Committee during a hearing packed with curious onlookers hoping to snap a photo of the star guest. “Mass incarceration is ineffective, it’s harmful and it’s expensive.”